Ricoh Company, Ltd.

Jnc Corporation

Shinichi Wakamatsu

Naohiro Watanabe

Hiroshi Yamashita

Tsuyoshi Sugimoto

Masaki Watanabe

Masahide Yamada

Naohito Shimota

Akinori Saitoh

Masahiro Ohki

Tsunemi Sugiyama

Junichi Awamura

Toshiki Nanya

Eiji Sawamura

Kazuyuki Hirai

Kazushige Yasumatsu

Hiroshi Yamada

Shigeru Emoto

Ryota Inoue

Tomomi Suzuki

Tsuneyasu Nagatomo

Takayuki Yoshii

Akihiro Kotsugai

Satoshi Ogawa

Yoshihiro Moriya

Mikio Yamahiro

Masana Shiba

Kenya Itoh

Kazushige Sanyo Chemical Ind Ltd Yasumatsu

Kazuyuki Sanyo Chemical Industries Ltd Hirai

The present invention provides a toner containing at least a binder resin and a pigment, wherein the amount of the pigment in the toner is 3.0% by mass to 8.5% by mass, the volume average particle diameter of the toner is 2.0 &#x3bc;m to 6.0 &#x3bc;m, and a monochrome image, which has been fixed on a recording medium so that the amount of the toner adhered onto the recording medium is 0.25 mg/cm, has a reflection density of 1.2 to 2.5.

Toner, developer, and image forming method

A toner including at least one polyester resin serving as a binder resin, a colorant, a releasing agent, and a fixing aid, wherein the fixing aid includes a fatty acid amide-based compound, and the fatty acid amide-based compound is at least one of a fatty acid amide compound having a mono- or higher valent amide bond and a fatty acid amide-based compound having a mono- or higher valent amino group or a hydroxyl group.

Toner, developer, toner accommodating container, process cartridge and image forming method

A toner according to the present invention contains at least a polyester resin as a binder resin, a colorant, a releasing agent, a fixing-assisting component, and a fatty acid, wherein the fixing-assisting component has a melting point of 60&#xb0; C. to 120&#xb0; C. and contains at least one of an esterified compound obtained by esterification of the fatty acid and an amide compound obtained by amidation of the fatty acid.

Toner, developer, toner container, process cartridge, and image forming method

A toner produced by a method including dissolving or dispersing toner components comprising a colorant and at least one of a binder resin and a precursor thereof in an organic solvent to prepare a toner components liquid, dispersing the toner components liquid in an aqueous medium including a surfactant, a particulate resin A having the same polarity as the surfactant and a volume average particle diameter of from 5 to 50 nm, and a particulate resin B having a volume average particle diameter of from 10 to 500 nm to form liquid droplets, and removing the organic solvent from the liquid droplets. The particulate resin B is incompatible with the binder resin and swells in the organic solvent.

Toner, image forming method, and process cartridge

Disclosed is a resin particle having a volume average particle diameter of 10 nm to 500 nm, obtained by polymerizing an addition polymerizable monomer containing a silsesquioxane (a) represented by Formula (I) or by copolymerizing the silsesquioxane (a) with an addition polymerizable monomer (b),  where Rto Reach independently represent a group selected from the group consisting of hydrogen, alkyl having 1 to 40 carbon atoms, substituted or unsubstituted aryl, and substituted or unsubstituted arylalkyl; any hydrogen in the alkyl group is optionally substituted by fluorine and any &#x2014;CH&#x2014; is optionally substituted by &#x2014;O&#x2014;, &#x2014;CH&#x2550;CH&#x2014;, cycloalkylene or cycloalkenylene; any hydrogen in alkylene in the arylalkyl group is optionally substituted by fluorine and any &#x2014;CH&#x2014; is optionally substituted by &#x2014;O&#x2014; or &#x2014;CH&#x2550;CH&#x2014;; and Arepresents an addition polymerizable functional group.

Resin particle, toner, and image forming method and process cartridge using the same

A magenta toner, produced by a method including suspending an oily liquid comprising a binder resin and a colorant in an aqueous medium, wherein the colorant comprises a naphthol pigment and a quinacridone pigment, and the quinacridone pigment comprises a pigment having a specific formula.

Magenta toner and developer

Provided is a toner for image formation, granulated by dispersing, emulsifying, or both dispersing and emulsifying an oil phase containing toner constituting materials in an aqueous medium. The toner constituting materials contain a binder resin, a colorant and a pigment dispersant which is a polyester derivative having an acid value of 28 to 50 mgKOH/g and an amine value of 1 to 50 mgKOH/g, and satisfy the following Expressions 1 and 2, where Expression 1 represents a mass ratio, &#x3b1; is a glass transition temperature of the binder resin, and &#x3b2; is a glass transition temperature of a mixture of the binder resin and the pigment dispersant in the ratio of Expression 1.Binder resin:Pigment dispersant=100:5&#x2003;&#x2003;Expression 10&#xb0; C.&#x2266;&#x3b1;&#x2212;&#x3b2;&#x2266;10&#xb0; C.&#x2003;&#x2003;Expression 2

Toner for image formation, method for producing toner, container containing toner, two-component developer, process cartridge, and image forming method

A toner is provided including a binder resin and a wax having primarily C&#x2014;H and C&#x2014;C bonds, and having a melting point of 50 to 90&#xb0; C., wherein the wax is present in a surface portion of the toner in an amount of from 0.1 to 4.0% by weight, wherein the amount of the wax is determined by Fourier transform infrared spectroscopy attenuated total reflectance (FTIR-ATR); and the use of the toner in an image forming method, image forming apparatus, developer and toner cartridge containing the toner.

Toner, developer, image forming method, image forming apparatus, process cartridge, and toner container

A toner is provided that includes a release agent, a colorant, a binder resin including a polyester resin, and a fixing auxiliary component including an ester compound of a fatty acid with an alcohol. The fatty acid includes stearic acid and behenic acid in a total amount of 80% by weight or more. The alcohol includes ethylene glycol in an amount of 80% by weight or more. The ester compound has a hydroxyl value of 10 to 100 mgKOH/g.

Toner, developer, toner container, process cartridge, image forming method, and image forming apparatus

A toner including a binder resin including a polyester resin, a colorant, and a release agent including a polyglycerin ester having a melt viscosity of from 1.0 to 40 mPa&#xb7;sec at 120&#xb0; C. and a hydroxyl value of from 0 to 100 mgKOH/g is provided. The polyglycerin ester is an ester of a polyglycerin having an average polymerization degree of from 2 to 10 and an aliphatic acid having 16 to 24 carbon atoms in average.

A toner containing a colorant, and a binder resin, wherein the toner is prepared by dissolving or dispersing a colorant, a precursor of the binder resin having a site capable of reacting with an active hydrogen group-containing compound, the active hydrogen group-containing compound, in an organic solvent, to prepare a toner constituent mixture liquid, dispersing or emulsifying the toner constituent mixture liquid, in an aqueous medium while subjecting the precursor to a reaction with the active hydrogen group-containing compound, to prepare a toner dispersion, and removing the organic solvent from the toner dispersion; the binder resin contains a modified polyester having an isocyanate-derived binding site; the Sn content in the toner is 800 ppm or less; the content of a metal which is non Sn and derived from a polyesterified catalyst is 10 ppm to 200 ppm; and the content of a metal which is non Sn and derived from an isocyanated catalyst is 10 ppm to 200 ppm.

Toner, developer, toner container, process cartridge, image forming apparatus, and image forming method

A toner is provided including a colorant; a first binder resin; and a second binder resin, wherein an amount of the first binder resin and an amount of the second binder resin are phase separated from each other in the toner, and wherein a phase of the first binder resin is partially or completely covered with a phase of the second binder resin; and a method of preparing the toner, and a developer, an image forming method, an image forming apparatus, and a process cartridge using the toner.

Toner, method of preparing the toner, and developer, image forming method, image forming apparatus, and process cartridge using the toner

To provide a toner containing an ethyl acetate-soluble polyester component and an ethyl acetate-insoluble polyester component, wherein the toner is granulated in an aqueous medium, the ethyl acetate-insoluble polyester component is obtained by elongating and/or cross-linking a modified polyester resin during granulating and/or after granulating, the modified polyester resin is produced by condensation polymerization of an acid component and at least one type of diol compound selected from aliphatic diol and alicyclic diol in the presence of a catalyst, and the mass average molecular weight of the modified polyester resin is 10,000 to 100,000.

Toner and developer, toner container, process cartridge, image forming apparatus, and image forming method using the same

A toner is provided including a binder resin including at least one polyester resin in an amount of from 50 to 100% by weight, and a colorant having a specific formula, wherein the toner has a shape factor SF-1 of from 120 to 150 and a shape factor SF-2 of from 125 to 180; and a developer using the toner.

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Numazu, Japan

Shinichi Wakamatsu